From 0ebcd6f3570dd66bff0930872b8bf859bdcf302a Mon Sep 17 00:00:00 2001

Message-Id: <0ebcd6f3570dd66bff0930872b8bf859bdcf302a.1477548646.git.panand@redhat.com>

From: Pratyush Anand <panand@redhat.com>

Date: Thu, 27 Oct 2016 11:34:33 +0530

Subject: [PATCH] x86_64: fix page_offset calculation

Kernel text region lies above __START_KERNEL_map, which is linearly mapped

however not a direct mapping. Direct mapping region lies below it instead.

So, page_offset can only be calculated with a region which is below

__START_KERNEL_map.

Signed-off-by: Pratyush Anand <panand@redhat.com>

---

 arch/x86_64.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86_64.c b/arch/x86_64.c

index 13990cef839b..3ef33ae4ef2d 100644

--- a/makedumpfile-1.6.0/arch/x86_64.c

+++ b/makedumpfile-1.6.0/arch/x86_64.c

@@ -41,7 +41,7 @@ get_page_offset_x86_64(void)

 	unsigned long long virt_start;

 	for (i = 0; get_pt_load(i, &phys_start, NULL, &virt_start, NULL); i++) {

-		if (virt_start >= __START_KERNEL_map) {

+		if (virt_start < __START_KERNEL_map) {

 			info->page_offset = virt_start - phys_start;

 			return TRUE;

 		}

-- 

2.7.4